Last Days in Utah
Moab is known mostly for its proximity in Southeastern Utah to two National Parks, Arches and Canyonlands. We ventured out and hiked in both parks to explore the beauty and uniqueness of each. Arches National Park has the densest concentration of natural stone arches in the world. There are over 2,000 documented arches in the park, ranging from sliver-thin cracks to spans greater than 300 feet. This area was once a massive desert, full of shifting dunes of fine-grained sand called the Estrada Formation. This sand formed a hard rock that is very porous, unlike the Carmel Formation that is made of sand and clay, which is softer and resists water. Both exist in the park. Rainwater soaks into the porous Estrada Sandstone easily, but gets trapped by the Carmel. It can slowly dissolve the calcite bonding the sand together, “rotting” rock from the inside out. In winter, water trapped in cracks expands when it freezes, then contracts, prying the rock apart. As erosion happens, a variety o...